Una empresa que se dedica a la explotación de gas extrayéndolo mediante técnicas de fracking usa agua depurada procedente de los saneamientos de las casas para sus operaciones. El objetivo final es evitar el consumo de agua potable

http://eandt.theiet.org/news/2015/aug/toilet-frack.cfm

A shale oil producer has started using treated water from toilets, sinks and showers to carry out fracking in Texas. The process of fracking requires millions of gallons of water, along with sand and chemicals, to be blasted into a well to crack oil or gas-containing rocks and allow the fuels to escape.